Chapter 17, Problem 54GP

A small ball D has a charge of $-10nC$ and cannot move. You move another small ball E that has a charge of $—5nC$ from point 1 to point 4 as shown in Figure P17.54. Determine the work done by you on ball E when you move it (a) from 1 to 4 along the path shown via 2 and 3 (determine the work for each step separately), and (b) along a straight line from 1 to 4. (c) Compare your two answers for parts (a) and (b) and explain the comparison.